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B. NEWTON. Fuel Economizer.

No. 233,002. Patented Oct. 5,1880.-

WITNESSES LVM My 7 MJETERS, PMOTOMTHOGR UNITED STATES PATENT OFFICE.

ROBERT NEWTON, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR OF ONE- HALF OF HIS RIGHT TO BARNARD OOLLINGHAM, OF SAME PLACE.

FUEL-ECONOMIZER.

SPECIFICATION forming part of Letters Patent No. 233,002, dated October 5 1880.

Application filed May 12, 1880.

To all whom it may concern Be it known that I, ROBERT NEWTON, of the city and county of Providence, and State of Rhode Island, have invented a'new and usefulImprovementin Fuel-Economizers; and I hereby declare that the following is a full, clear, and exact description of the same, referenc'e being had to the accompanying drawings, forming part of this specification.

Thisinvention has reference to an improvement in the construction of water-grates or fuel-economizers for steam-generators.

The invention consists in the peculiar and novel construction of the water-grate and the bars placed between the water-bars, as alsoin the bridge-wall, as will be more fully set forth hereinafter.

Figure l is a view showing the economizer or water-grate secured under a steam-generator and connected with the same. Fig. 2 is a top view of the economizer. Fig. 3 is an enlarged sectional view of the end piece or multiple, and shows the manner in which the tubes are secured, as also the bearer for the grate-bars. Fig. 4 is a crosssect-ion, showing the alternate water-tubes and grate-bars.

In the drawings, A is a steam-generator. b is a pipe descending preferably from the lower part of the steam-generator. c is a pipe leading to the bridge at the intersection of I) and c atb.

The blow-01f pipe ought to be connected so that all the water may be drawn from the generator and the water-grate.

(l is the bridge, and 6 care a number of tubes secured to the bridge and also to the box g at the front of the grate. The box 9 is again connected with the steam-generator, and preferably at a point near to but below the water-line. By this arrangement the water from the lower part of the steam-generator passes into the hollow bridge through the tubes 0 and up the pipe it into the steamgenerator, thus adding heat to the water as it passes through the tubes, increasing the cir- (No model.)

culation in the generator, and preventing the accumulation of impurities in the boxes or tubes. Not only does the water-grate add to the steam-generating power of the boiler, but the rapid circulation of the water improves the steaming capacity of the whole generator.

The bridge-wall d, forming a hollow box, secures additional heatingsurtace, and prevents the formation of clinkers. Both the bridgewall (1 and the box 9 are provided with the rib 1 on which the grate-bars ff rest. These grate-bars fit between the tubes 0 e at both ends, and also near the center, but allow free access of air to the fuel from the ash-pit.

The tubes 0 c are secured in the box g and bridge-wall d by slightly tapering the ends of the tubes, forcing them into slightly-tapering holes in the box and bridge, and driving the ring it into the tube end, as is shown in Fig. 3.

To reach the tubes, for driving the ring is as well as for cleaning and inspection, the screwplugs l l are placed one opposite the ends of each tube. The whole forms a simple and durable grate, which by the absorption of heat directly from the fire adds greatly to the capacity of a steam-generator, and by indncin g a circulation of water becomes an efficient economizer of fuel, readily adapted to any kind of steamgenerators.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- The combination, with the hollow bridgewall (I and the box 9. both connected with the steam-generator, and both provided with the plugs 11, of the tubes 6 c and the grate-bars f, provided with projections at their ends and near the center to fit between the tubes, the whole connected with the generator, as and for the purpose described.

ROBERT NFNVTON.

Witnesses:

.TosEPH A. MILLER. J osnrn A. MILLER, Jr. 

